verb (used with object), verb (used without object)
to unwind from a coiled position.

1705–15; un-2 + coil1

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World English Dictionary
uncoil (ʌnˈkɔɪl)
to unwind or become unwound; untwist

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When you pull on the rubber band, the chains tend to uncoil and partially align with one another.
Uncoil the cable on the ground away from the pole before hoisting.
It is also of great benefit to have a tether real to coil and uncoil the tether.
The double helix has to first uncoil in order for it to be copied.
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